Not unsurprisingly, the National Geographics site contains some awesome photos - below are examples from four galleries of its Patterns in Nature series: Enigmatic Earth, Mysterious Earth, Aurorae and Sand.

The complexly branched arms of the basket sea star, or starfish, catch plankton for the echinoderm.
Photograph by Brian J. Skerry

The borders of four nations—Saudi Arabia, Oman, Yemen, and the United Arab Emirates—blur beneath the shifting sands of the Rub al Khali, or Empty Quarter, desert.
Photograph by George Steinmetz

The northern lights turn the night sky an otherworldly green above Wapusk National Park in Manitoba, Canada.
Photograph by Norbert Rosing

Strange creatures slithering up from the Empty Quarter desert floor in the Arabian Peninsula are really a network of barchan dunes—sculpted by winds that over time strike the sand from a consistent direction.
Photograph by George Steinmetz
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